Luna ODiSI 6 User manual

User’s Guide │ODiSI 6

ODiSI 6
ODiSI 6 User’s Guide
Page i
Many regions prohibit the disposal of WEEE (Waste Electrical
and Electronic Equipment) in the normal waste stream, to
comply with the Restriction of Hazardous Substances (RoHS)
released into the environment. Please contact your local waste
authority for instructions on proper recycling of the electronic
product(s) described in this User Guide.
Optical Distributed Sensor Interrogator Model ODiSI 6:
User’s Guide ODiSI 6 Software
© 2020
Luna Innovations Inc.
3155 State Street
Blacksburg, VA 24060
Phone: [phone]
Fax: [phone]
E-mail: solu[email protected]m
Web: www.lunainc.com

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ODiSI 6 User’s Guide
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Table of Contents
1 Glossary.................................................................................................................................. 5
2 Safety...................................................................................................................................... 7
3 System Overview.................................................................................................................... 7
ODiSI Instrument Specifications....................................................................................... 8
Hardware and Physical Setup..........................................................................................10
Assembly.........................................................................................................................10
4 Software Overview.................................................................................................................12
Operational Parameters...................................................................................................12
Manage the Sensor Repository .......................................................................................13
View and Evaluate Sensor Status....................................................................................13
Set Up the ODiSI for Data Logging..................................................................................13
Run a Test.......................................................................................................................13
View Test Data................................................................................................................14
5 Software Quick Start Guide....................................................................................................14
Operational Parameters...................................................................................................14
Installing a Sensor...........................................................................................................15
View and Evaluate Sensor Status....................................................................................16
Set Up the ODiSI for Data Logging..................................................................................19
Run a Test.......................................................................................................................21
View Test Data................................................................................................................24
6 Using the ODiSI 6 Software ...................................................................................................28
Operational Parameters...................................................................................................28
Instrument Status......................................................................................................28
Operational Parameters............................................................................................28
Channel Status .........................................................................................................32
Example: Operational Parameters ............................................................................35
Manage Sensors .............................................................................................................36
View and Evaluate Sensor Status....................................................................................37
Sensor Tare..............................................................................................................38
Sensor Key ...............................................................................................................38
Define Gages............................................................................................................39
Plot Navigation..........................................................................................................40

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Set Up the ODiSI for Data Logging..................................................................................41
File Saving................................................................................................................41
Managing Test Data Files .........................................................................................43
Copy Test Data.........................................................................................................44
Copying Test Data TSV Files....................................................................................45
Settings Menu...........................................................................................................47
Run a Test.......................................................................................................................56
Sensor Plot ...............................................................................................................56
Gage Plot..................................................................................................................57
View Test Data................................................................................................................58
Play Back Test Data..................................................................................................58
Generate TSV File ....................................................................................................62
Manage Configuration .....................................................................................................66
Update Feature Keys.......................................................................................................68
Time Synchronization Settings ........................................................................................68
Help...............................................................................................................................69
Documentation........................................................................................................69
Send us feedback ...................................................................................................70
Update....................................................................................................................71
Language................................................................................................................72
About ......................................................................................................................73
7 ODiSI Remote Operation .......................................................................................................74
ODiSI Remote Application...............................................................................................74
Remotely Control an ODiSI.......................................................................................74
Stream in ODiSI Measurement Data.........................................................................74
ODiSI Remote-control Interface.......................................................................................75
ODiSI Remote-control Commands............................................................................75
ODiSI Controller Status.............................................................................................76
ODiSI Remote-control Workflow................................................................................78
8 ODiSI Measurement Streaming Protocol (OMSP)..................................................................81
Terminology.....................................................................................................................81
Channel ....................................................................................................................81
Sensor ......................................................................................................................81
Gage.........................................................................................................................81

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Segment Vector ........................................................................................................82
Streaming Connection.....................................................................................................82
Message Types...............................................................................................................82
Metadata Messages........................................................................................................83
Contents ...................................................................................................................83
Example....................................................................................................................86
Measurement Message...................................................................................................87
Contents ...................................................................................................................87
Example....................................................................................................................89
Tare Message .................................................................................................................89
Contents ...................................................................................................................89
Example....................................................................................................................91
Receiving Messages Across TCP Packets......................................................................91
9 Additional Information ............................................................................................................92
Sensing Results near the Fiber Termination....................................................................92
System Operation Guidelines..........................................................................................93
Vibration Tolerance .........................................................................................................93
Test Setup.................................................................................................................93
Strain Test Setup ......................................................................................................93
Troubleshooting Dropouts.........................................................................................93
General Troubleshooting...........................................................................................95
10 Product Support Contact Information ...................................................................................98

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ODiSI 6 User’s Guide
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1Glossary
Term
Definition
Channel
A port on the front panel of the ODiSI instrument. There is a
maximum of 8 channels on an ODiSI.
Configuration
A set of Luna defined hardware and software parameters that
change the measurement capabilities of the ODiSI instrument.
Measurement parameters that change between configurations
include (but are not limited to): measurement rate, maximum
sensor length, and gage pitch. The ODiSI software
automatically selects the fastest measurement rate based on
the maximum sensor length detected and user-selected Gage
Pitch.
Gage
Subset of a fiber sensor that is used to make a single strain or
temperature measurement. A fiber sensor is divided into
numerous gages which provide distributed measurements of
strain or temperature along the fiber.
Gage Pitch
Length of fiber between the center of a single gage and the
center of a neighboring gage.
High-Definition
(HD) Sensor
A fiber sensor that provides a unique Rayleigh scatter signature
that the ODiSI instrument can use to make distributed strain or
temperature measurements.
Measurement
Rate
This is the rate (in Hz) at which the ODiSI provides strain or
temperature measurements.
ODiSI
Measurement
Streaming
Protocol (OMSP)
JSON based protocol for the transfer of ODiSI strain or
temperature data to another PC.
Sensor
Key/Reference
Data set containing the unique Rayleigh scatter pattern of a
single fiber sensor. This is compared to measurement scans to
calculate strain or temperature. When a sensor is rekeyed, a
new reference data set is captured. Once installed or
generated, these files are stored in the Sensor Repository on
the ODiSI controller.
Standard Length
Remote Module
Supports sensor lengths from 1 m to 20 m.
Extended Length
Remote Module
Supports sensor lengths from 1 m to 50 m.
RLC
Ruggedized LC connector. These connectors are used for the
connections between the standoff cable and ODiSI instrument
as well as between the standoff cable and the remote module.

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Segment
A collection of Gages defined by a Start Gage and an End
Gage.
Sensor (Strain)
A fiber optic cable sensitive to strain.
Sensor (CFG)
Continuous Fiber Grating (CFG) fiber sensor sold by Luna.
Rather than utilizing the intrinsic Rayleigh backscattering of the
fiber, fiber Bragg gratings are written into the fiber and utilized
by the ODiSI system to make distributed measurements.
Sensor
(Temperature)
A fiber optic cable sensitive to temperature.
Sensor
(SC Temperature)
A fiber optic cable sensitive to temperature with strain
compensation.
Sensor Length
Length of the sensing region of the fiber optic sensor.
Sensor
Repository
Directory on the ODiSI controller that contains sensor specific
data such as reference files, Tares, and Gage and Segment
definitions. Installing and uninstalling sensors adds or removes
this sensor data.
Standoff Cable
Length of optical fiber placed between the ODiSI instrument
and the remote module. This length does not count toward the
system’s sensor length. The ODiSI instrument can be used with
several different standoff cable lengths with RLC connectors on
each end: 10 m, 50 m, 100 m, 150 m, and 200 m. The longer
lengths can be achieved by connecting two shorter standoff
cables together using a Luna provided connector.
Strain
Coefficients
Polynomial coefficients used to accurately scale optical
frequency measurements into strain. These coefficients can
vary between sensors and are calibrated at the factory.
Temperature
Coefficients
Polynomial coefficients used to accurately scale optical
frequency measurements into temperature. These coefficients
can vary between sensors and are calibrated at the factory.
Test Data
Binary file containing measurement data from an ODiSI.
Time Stamp
The time at which a raw (optical) data acquisition was collected
by the ODiSI instrument. Time stamps are always with
reference to UTC.
Touch to Locate
The process of sequentially identifying individual Gage
locations using a hot or cold input.
TSV File
Tab separated value data file containing measurement data
from an ODiSI.

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2Safety
The advisory words Danger, Warning and Caution used in this manual identify the level of
hazard that may be encountered by the user.
•DANGER means if the danger is not avoided, it will cause death or serious injury.
•WARNING means if the warning is not heeded, it can cause death or serious injury.
•CAUTION means if the precaution is not taken, it may cause minor or moderate injury.
Warning
The protection provided by the equipment may be impaired if the equipment is used in a
manner not specified by the manufacturer, resulting in serious injury or death.
The power cord is the main electrical disconnect for this equipment. If it is necessary to ensure
no power to the unit, remove the power cord.
The use of controls, adjustments, performance, or procedures other than those specified
herein may result in hazardous laser radiation exposure and one or more safety protections
may be impaired or rendered ineffective.
Attention
La protection fournie par l'équipement peut être compromise si l'équipement est utilisé d'une
manière non spécifiée par le fabricant, entraînant des blessures graves ou la mort.
Le cordon d'alimentation est le principal disjoncteur électrique de cet équipement. S'il est
nécessaire de ne pas mettre l'appareil hors tension, retirez le cordon d'alimentation.
L'utilisation de commandes, d'ajustements, de performances ou de procédures autres que
celles spécifiées ici peut entraîner une exposition dangereuse au rayonnement laser et une
ou plusieurs protections de sécurité peuvent être altérées ou rendues inefficaces.
3System Overview
Luna Innovations’ Optical Distributed Sensor Interrogator (ODiSI 6) is a strain and
temperature measurement system designed to meet the needs of engineers and scientists
who are performing material characterization, process control, structural testing, and service
life monitoring of vehicles, components, power systems, and a variety of other applications.
The ODiSI employs an optical frequency domain reflectometry (OFDR) technique to interpret
the signal from fiber optic sensors to make strain and temperature measurements on a test
article.

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The ODiSI’s fiber optic sensors range from 1 m to 100 m in length for distributed strain
measurements and 1 m to 5 m for temperature measurements. Optical fiber’s flexibility and
small diameter (< 0.2 mm) lends itself to being located and routed through and inside parts
and locations not typically accessible with foil gages and thermocouples.
Because optical fibers undergo well defined local optical changes as a result of changes in
strain and temperature, the ODiSI is able to interpret the reflected signal along a sensor into
independent strain or temperature measurements throughout the length of the fiber at
intervals as low as 0.65 mm.
Figure 3-1 ODiSI sensor fiber.
ODiSI Instrument Specifications
The ODiSI platform is available in several channel configurations. Channels are sampled
serially at the maximum allowable data rate for thespecific sensor length and number of active
channels. Both temperature (not SCTemperature) and strain sensors canbe used on different
channels during the same test. A test with SC Temperature sensors cannot contain other
sensor types. A test with Luna CFG sensors cannot contain other sensor types.
The table below outlines the performance specifications for different configurations. Further
details can be found in the product data sheet, which is available on the Luna website
(www.lunainc.com).

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This User’s Guide uses examples and graphics from a setup with multiple sensors. It is
important to note, however, that whether the system is set up for one or multiple sensors, the
hardware setup and the application interface remain consistent.